首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   678篇
  免费   44篇
各国政治   34篇
工人农民   90篇
世界政治   31篇
外交国际关系   33篇
法律   372篇
中国共产党   1篇
中国政治   25篇
政治理论   127篇
综合类   9篇
  2024年   1篇
  2023年   13篇
  2022年   9篇
  2021年   9篇
  2020年   24篇
  2019年   32篇
  2018年   29篇
  2017年   49篇
  2016年   41篇
  2015年   33篇
  2014年   32篇
  2013年   92篇
  2012年   53篇
  2011年   29篇
  2010年   35篇
  2009年   36篇
  2008年   28篇
  2007年   27篇
  2006年   27篇
  2005年   26篇
  2004年   22篇
  2003年   17篇
  2002年   11篇
  2001年   11篇
  2000年   3篇
  1999年   3篇
  1998年   3篇
  1997年   5篇
  1996年   1篇
  1995年   2篇
  1994年   1篇
  1992年   3篇
  1990年   2篇
  1989年   2篇
  1988年   4篇
  1987年   2篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
排序方式: 共有722条查询结果,搜索用时 718 毫秒
41.
The chimera of modern biotechnology is defined broadly as a single organism composed of a mixture of materials from two or more organisms possessing distinct genetic backgrounds. Unlike the United States, which does not regulate chimeras directly, Canada has responded to the unregulated pursuit of chimera technology by banning certain chimeras as part of comprehensive legislation designed to regulate human reproductive technologies. In 2004, the Canadian Parliament passed the Assisted Human Reproduction Act despite criticism urging greater legislative justification for the Act's provisions and modification to it statutory definitions. Because current regulatory mechanisms in the United States, including patent law and administrative oversight, fail to regulate chimera technology, the United States should enact new legislation, using Canada's legislation as a model, to prohibit embryonic chimeras and to regulate other human-nonhuman combinations. Unregulated biotechnology threatens to disrupt legal and social institutions; therefore, the United States must make a balanced effort now to protect the public interest.  相似文献   
42.
The investigation of the neck structures drawn from 145 cases of asphyxia involving pressure on the neck, for which microscopic examination was required at the Pathology Laboratory of the "Hotel Dieu" Hospital from Lyon, France, during January 1, 1999, to May 1, 2001, has pointed out in 3 cases, besides the classic signs already known, a particular lesion unmentioned yet in the literature, namely, a pericarotid bone splinter, placed in the proximity of the common carotid artery bifurcation. The bone splinters had dimensions between 0.25 and 0.7 mm and a certain antemortem character, surrounded by hemorrhagic areas and by fibrin. The 3 cases deal with adult males who had died through complete hanging, with the knot placed lateral, the hanging mark having the maximum depth in the laterocervical region, correspondent with our finding. Given the location of the bone splinter, we believe that this was produced by the tearing out from the transverse apophysis of the fourth cervical vertebra, as a consequence of the sudden traction during hanging. This sign appeared neither at other types of hanging nor at strangulation by hand or by ligature.  相似文献   
43.
"Persistent vegetative state" (PVS) describes brain-damaged patients who survive their injuries in a sleeplike, insensible state, with periodic awakenings. Due to technological advances, such individuals can sustain biological existence for prolonged periods of time. Their existence results in a dichotomy between the legal and medical interpretations of persistent vegetative states, giving rise to ethical conflicts. The author reviews the limitations in our understanding of what PVS signifies for the afflicted individual, and explores the conflicts arising from such limitations that may impact an individual's right to live or die. The author concludes that the medical community has yet to adopt consistent clinical criteria to diagnose PVS and that a universal standard for PVS is needed to avoid the abuse of vegetative individuals' rights.  相似文献   
44.
The fingernails of Mary Sullivan, the last victim of the Boston Strangler, were examined to determine if any genetic information about the murderer could be obtained. The nails were extremely friable necessitating the development of new techniques for isolating and purifying DNA. DNA yields from nails were optimized by using a NaOH-based preparation technique, which was simple, efficient, and minimized handling. Methods for selectively and thoroughly removing exogenous material on nails were also developed through use of a species-specific PCR assay, wherein mitochondrial DNA from the nail could easily be differentiated from DNA of contaminating cells.  相似文献   
45.
46.
47.
Abstract: Gender “mainstreaming” is an important concept in feminist politics because it integrates a gendered perspective into all policy- and decision-making. However, while most scholars agree that gender mainstreaming has the potential to transform social relations, to date it has been limited and delivered only marginal benefits for a few women. In the Canadian context, scholars have pointed to several contextual and conceptual issues that limit the transformative potential of gender-based analysis. While such studies have contributed to our understanding of the impacts of gender mainstreaming, the author suggests that we must also explore the creative or productive dimensions of mainstreaming. When we do so, we see that gender mainstreaming constructs a new form of worker: the “gender expert,” who is then given authority to analyse, monitor and suggest interventions based on “expert analysis.” From this perspective, gender analysis becomes a “technology of rule,” constructing gender experts whose power ultimately goes unscrutinized in the context of the organization, thus obscuring the ways in which gender systems are reproduced or fractured by gender mainstreaming itself. In closing, the author calls for a reorientation of gender mainstreaming, away from an analytic approach that focuses only on the instrumental effects of policies and towards an approach that illuminates both the instrumental and creative impacts of policies.  相似文献   
48.
The basis of ethnic inequality is set during preschool age. This article aims to explain developmental ethnical differences by using a resource-investment-model. The question is, wether the influence of the ethnic origin could be mediated by the social background and parental investments. The project “Preschool education and educational careers among migrant families” supplied data on 1046 families. The analyses clearly show ethnic differences in early development. These differences persist even after controlling for the socioeconomic background, but disappear after controlling for the investments of the parents. Therefore, the family background and the investment of parents in their children’s home environment improve the developmental score of the child and explain the observed ethnic differences. Additional analyses show that among German children the social background is even more important than among Turkish children. The differential development of Turkish children is mainly stimulated by their parent’s investments.  相似文献   
49.
Abstract:  This article examines the European approach to joint venture regulation. It updates previous analysis by examining the impact of modernisation reforms on joint venture regulation in Europe. It is argued that although the changes on the whole are conducive to joint venture activity, problematic aspects of regulation were either unaddressed, or could be provoked by, the reform. In particular, the substantive and procedural divide in legal treatment of 'concentrative' and 'cooperative' joint venture arrangements continues to engender some difficulty.  相似文献   
50.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号